This frame grab from video was taken by an individual not employed by the Associated Press and obtained by the AP outside Iran from FreedomMessenger, that describes itself as an "independent Iranian news agency seeking complete change of the Iranian regime by reporting on the human rights situation in Iran," purports to show attack on Iran police station in Qahdarijan, Iran, Tuesday, Jan. 2, 2018. Six rioters were killed during the attack on the police station, according to Iranian state TV. It reported that clashes were sparked by rioters who tried to steal guns from the police station. (FreedomMessenger via AP)

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The Trump administration stepped up its support for protesters in Iran on Tuesday, calling on the government to stop blocking Instagram and other social media sites while encouraging Iranians to use special software to circumvent controls.